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Special relativity question


Active member
Jan 26, 2012
A pursuit spacecraft from the planet Tatooine is attempting to catch up with a Trade Federation cruiser. As measured by an observer on Tatooine, the cruiser is traveling away from the planet with a speed of 0.6c. The pursuit ship is traveling at a speed of 0.8c relative to Tatooine, in the same direction as the cruiser. What is the speed of the pursuit ship relative to the cruiser?


Indicium Physicus
Staff member
Jan 26, 2012
I think you need this equation. In your case, $s$ is the velocity of the cruiser, you can make $v$ the velocity of the pursuit ship, and $u$ is the motion of the pursuit ship relative to the cruiser. Solve for $u$. Does that work for you?